Although, Nash equilibrium has played a great role in helping groups and individuals in making the best decision easily, but it has made economics useless. If a party knows the strategies of the other party then the all the calculations that can be made in order to make that decision would be wrong and so since they would be different from the obvious, they would be incorrect.
Nash equilibrium has had a great impact on the decision making by people but in many cases, the decisions that are made are wrong and would not give maximum amount of advantage. If both parties choose to change their decisions then a much better result can be obtained. When both parties find out the strategies of the other party so they should use the economic theories and formulas and then acquire a much better result.